395:(pyramidalis) muscles, in the bridge of the nose, arise from the lower nasal bone to the lower forehead, on each side of the midline. The procerus muscles pull the skin into horizontal wrinkles. The frontalis muscle, which runs from the upper forehead, halfway between the coronal suture (which traverses the top of the skull) and the top edge of the orbit, attaches to the eyebrow skin. Since it pulls the eyebrows upward, it is the antagonist of the orbicularis oculi. It is used in looking up, and increasing vision if there is insufficient light or when objects are far away.
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Each time the eyelids are closed through the action of the orbicularis, the medial palpebral ligament is tightened, the wall of the lacrimal sac is thus drawn lateralward and forward, so that a vacuum is made in it and the tears are sucked along the lacrimal canals into it. The lacrimal part of the
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of this muscle; it raises the upper eyelid and exposes the front of the bulb of the eye. In addition, the orbital and palpebral portions can work independent of each other, as in the furrowing of the brows by contraction of the orbital to reduce glare while keeping the eyes open by virtue of the
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orbicularis oculi draws the eyelids and the ends of the lacrimal canals medialward and compresses them against the surface of the globe of the eye, thus placing them in the most favorable situation for receiving the tears; it also compresses the
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The lacrimal part is a small, thin muscle, about 6 mm in breadth and 12 mm in length, situated behind the medial palpebral ligament and lacrimal sac. It arises from the posterior crest and adjacent part of the orbital surface of the
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There are at least 3 clearly defined sections of the orbicularis muscle. However, it is not clear whether the lacrimal section is a separate section, or whether it is just an extension of the preseptal and pretarsal sections.
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The orbital portion is thicker and of a reddish color; its fibers form a complete ellipse without interruption at the lateral palpebral commissure; the upper fibers of this portion blend with the
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pulls the eyebrows to the bridge of the nose, making a roof over the middle of the forehead and forehead wrinkles, used mainly to protect the eyes from excess sunlight. The
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at the outer canthus (corner) of the eye. The palpebral portion contains the preseptal and pretarsal muscles. The pretarsal orbicularis is thought to be responsible for the
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The muscle acts to close the eye, and is the only muscle capable of doing so. Loss of function for any reason results in an inability to close the eye, necessitating
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results in the inability to blink or close the ipsilateral eyelid. Subsequent lack of irrigation increases the risk of corneal inflammation and ulcers.
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or palpebræ, surrounds the circumference of the orbit, and spreads over the temple, and downward on the cheek.
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From this origin, the fibers are directed laterally, forming a broad and thin layer, which occupies the
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A number of auxiliary muscles assist in cooperating with the eyelid muscles. For example, the
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The palpebral portion of the muscle is thin and pale; it arises from the bifurcation of the
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Knowledge (XXG) articles incorporating text from the 20th edition of Gray's
Anatomy (1918)
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Becker, Bruce B. (1992). "Tricompartment Model of the
Lacrimal Pump Mechanism".
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301:; occasionally it is very indistinct. The lacrimal orbicularis facilitates the
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The palpebral portion acts involuntarily, closing the lids gently, as in
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musculus orbicularis oculi also musculus orbicularis palpebrarum
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212:is a muscle in the face that closes the
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216:. It arises from the nasal part of the
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867:Levator labii superioris alaeque nasi
16:Facial muscle that closes the eyelids
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365:. This part comprises two pieces:
220:, from the frontal process of the
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510:10.1016/S0161-6420(92)31839-1
357:relaxation of the palpebral.
325:of the eye in extreme cases.
1145:Muscles of the head and neck
823:Levator palpebrae superioris
635:Levator palpebrae superioris
132:Levator palpebrae superioris
433:of the 20th edition of
350:Levator palpebræ superioris
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952:Depressor labii inferioris
344:, and form the so-called "
192:Anatomical terms of muscle
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274:medial palpebral ligament
230:medial palpebral ligament
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101:(orbital, palpebral) and
51:medial palpebral ligament
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894:Levator labii superioris
22:Orbicularis oculi muscle
278:lateral palpebral raphe
105:(lacrimal) branches of
67:Lateral palpebral raphe
403:It is involved in the
1083:Inferior longitudinal
1078:Superior longitudinal
947:Depressor anguli oris
818:Corrugator supercilii
399:Clinical significance
389:corrugator supercilii
268:Palpebral orbicularis
862:Depressor septi nasi
811:depressor supercilii
288:Lacrimal orbicularis
1150:Human head and neck
889:Levator anguli oris
252:Orbital orbicularis
674:sphenomandibularis
321:at the minimum to
83:zygomatico-orbital
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789:Occipitofrontalis
763:Temporoparietalis
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299:puncta lacrimalia
282:spontaneous blink
210:orbicularis oculi
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161:A04.1.03.013
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107:facial nerve
47:Frontal bone
980:Soft palate
899:Zygomaticus
794:occipitalis
652:Masticatory
583:Extraocular
346:crow's feet
338:photophobia
138:Identifiers
1134:Categories
1088:Transverse
1045:Hyoglossus
934:Buccinator
703:masseteric
669:Temporalis
415:References
354:antagonist
342:senescence
262:corrugator
127:Antagonist
79:Ophthalmic
1071:Intrinsic
1033:Extrinsic
799:frontalis
756:posterior
741:Auricular
681:Pterygoid
535:PTCentral
458:eMedicine
319:eye drops
305:into the
303:tear pump
258:frontalis
243:Structure
103:zygomatic
62:Insertion
1093:Vertical
957:Mentalis
929:Risorius
845:Procerus
751:superior
746:anterior
708:temporal
664:Masseter
618:inferior
613:superior
601:superior
596:inferior
431:page 380
393:procerus
380:seen in
369:and the
334:blinking
313:Function
99:Temporal
1124:Anatomy
998:levator
850:Nasalis
686:lateral
628:lateral
591:Oblique
573:of the
571:Muscles
518:1495795
348:". The
237:eyelids
222:maxilla
214:eyelids
120:eyelids
118:Closes
114:Actions
87:angular
36:Details
1110:Portal
1025:Tongue
993:tensor
777:eyelid
724:Facial
698:Fascia
691:medial
623:medial
608:Rectus
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439:(1918)
332:or in
74:Artery
42:Origin
909:minor
904:major
877:Mouth
773:Scalp
429:from
330:sleep
196:[
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144:Latin
94:Nerve
837:Nose
575:head
514:PMID
260:and
208:The
173:2066
156:TA98
733:Ear
506:doi
456:at
180:FMA
168:TA2
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Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
